A) \[2\sqrt{16-{{(\vec{a}.\vec{b})}^{2}}}\]
B) \[\sqrt{16-{{(\vec{a}.\vec{b})}^{2}}}\]
C) \[2\sqrt{4-{{(\vec{a}.\vec{b})}^{2}}}\]
D) \[\sqrt{4-{{(\vec{a}.\vec{b})}^{2}}}\]
Correct Answer: A
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